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O-Rings
the O-ring size that works for me is a #321. 3= the diameter of the cord used to make the O-ring in 16th's and the 21 is the inside diameter in 16ths.
Anything around that size and cord thickness will work.
I took a 7k mile trip and the one I used lasted the entire trip.
If you have trouble finding one, look for a hydraulics shop, and they should be able to help you.
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